Automatic tobacco weigher



Aug. 17, 1937. DAMM I 2,090,252

' AUTOMATIC TOBACCO WEIGHER Filed Ndv. 7 19s: 2 Sheets-Sheet 1 Invent on- Wad er jam/m,

ywfiamm, B I 777% y 7 Aug. 17, 1937. w. DAMM 2,090,252

AUTOMATIC TOBACCO WEIGHER Filed Nov. 7, 19s: 2 Sheets-Sheet 2 by PM I 6 M W W Patented Aug.- 17, .1937

UNITED STATES PATENT OFFICE 2,090,252 AUTOMATIC TOBACCO WEIGHER Walter Damm, deceased, late of Paula Damm,

Germany, by Ruhr, Germany Essen-Ruhr, heiress, Essen.

Application November 7, 1933, Serial No. 897,072 In Germany June 18, 1930 1 Claim. (Cl. 2494) weight being weighed oil in the known automatic tobacco weighing machine of this kind by the outlet opening of the feed device leading to the weigher! being reduced in size at the end of the weighing operation and by this means a gradually diminishing quantity of. the material being conveyed. There is feed members for the coarse and fine charging, such as is known in the case of weighing devices for other purposes, and the tobacco to be weighed oir remains the same during the weighing oif operation.

The tobacco weigher forming the subject matter of the present invention also operates with a coarse and a fine charging period, the operation being such that during the coarse charging period the weigher, is charged with coarse (long fibre) tobacco and during the fine charging a period with'fine (short fibre) tobacco. For coarse and fine charging separate feed members are providedso that the coarse and line charging which follow one another are completely separated from one another. As feed members conveyor belts convey the bacco 'on to the same weighing device and are controlled in such a manner that they automatically come into operation one after the other.

This invention will be understood from the following description taken in connection with the drawings, in which:-

Fig. 1 is a diagrammatic side elevation of one form of the invention; Fig. 1a is a diagrammatic detail view showing particularly the electrical con- 45 nection for controlling the tobacco feeding belts; Fig. lb is an elevational detail showing the means for emptying the scale pan; Fig. 1c is a-diagrammatic side elevation; Fig. id is a similar front elevational view of the arrangement shown'in 50 Fig. 1c; and Fig. 2 is a diagrammatic front elevational view of the arrangement shown in Fig. 1.

From the container .li tobacco is removed by the pronged conveyor belt ii. The tobacco falls on the tilting or. swinging scale pan l3. After a 56 ce tain weight is reach d, *a contact on the locking of the scale pan no actual separation of the,

weighing device closes, and the belt to rest. At the same time by a second contact closing, the belt ll commences to move, which feeds loose or short tobacco. When the correct It is brought weight is reached, the belt I4 is brought to rest by a contact on the weighing device closing. When the bucket I5 is under the scale pan the closing of a contact on the bucket causes the to be released. The scale pan tilts over and the tobacco falls into the bucket i5. After the bucket has passed, the weighing device is locked again, the pointer returns into the zero position and the contact for 1 the-belt i2 is-again released.

A containerfor coarse tobacco is shown at H and a container for fine tobacco at Ii. A pronged belt I2 driven by an electric motor receives the oarse tobacco'from container ii and drops it on scale II. The container for fine tobacco H is located on the opposite side of scale it and a traveling electrically driven belt I receives fine tobacco from the container II and drops it on scale l3. Scale II is locked from tilting by releasable means. A series of buckets ii are fed electrically along a path to receive the contents of'scale II when the same is tilted. Appropriate electrical contacts are provided to perform the iollowingoperations: when belt I! has deposited on the scale [I nearly 100% of the weight desired the pointer on scale it makes a" contact stopping belt I 2 and starting belt H. when the total weight is received on scale pan I! the belt H is stopped.

It is important that the bucket l5 be positioned directly below the scale pan, when the scale pan tilts, as otherwise the material might fall between two buckets or simultaneously into two buckets. In order to ensure that the scale pan shall only tilt when a bucket i5 is in correct positioma releasing contact is provided on each bucket, which releases the previous locking of the scale pan and allows it to tilt. After the bucket I5 has passed, the scale pan returns to its normal position and the weighing device is locked again, the pointer returns into the zero position and the contact for the belt !2 is again released and the entire operation is repeated.

The method of control during the operation of applicant's tobacco weigher is not the subject matter of the application; it will be hereinafter distinctly set forth that patent protection is not claimed for this method or system ot control which correspondsto the known control means in other automatic weighers.

The control of. the tobacco feeding belts I! is effected'electricallyf The connection is shown in Fig.

effect an automatic closing and breaking of the circuit by means of contacts. The scale of the weighing device is provided with three contacts l, 2, 3. When'the ponter touches the contacts,

the desired .connection by means of the automatic devices is effected.

. belt l4. and finally touches'contact bythe belt It is stoped by the automatic dey fat ' belts are stationary.

simultaneously connected in circuit by the-automatic device 2.' The contactf3 is in the scale division which indicates the final weight, for example, 50 g. The pointer ascends further owing tothe supply of tobacco by means of "3 wherevice 2". The final weight is obtained and both After emptying the scale pan "IS" the pointer returns to the "8 scale division and when 'it touches the contact "i", the belt I2 is again set in motion. The new weighing operation is thereby started.-

When the pointer moves back from contact 3 to contact I, the pointer moves past contact 2 again and the belt W' would be connected in circuit. However, this is not desired since no contact may take place. By the mechaceaata 1a. There are connected to the motors of the belts automatic devices which in Figure 1b. The operation is mechanical.

this scale division.

desired scale division,

- the roller 7".

'11 e th be stpp d by .the scale pan "l3, which is thereby tilted and automatic device!" and the belt. "M" will be fine (short-fibre) tobacco.

anlsm or the weighing device, the pointer is slightly raised from the scale but only during the return movement whereby the pointer passes over contact 2 without touching the same. In

the 0" scale division, the pointer is again in itsorlginal position. The emptying of thescale pan "l3 is shown The bucket it receives a roller a. When passing through the bucket, the roller moves over the pressure .plate "b secured to the bell crank lever c. The bell crank leverc is secured to the shaft fg. rotatably mounted at "d. At

'the other end, the shaft "9 carries the lever "e-' with the roller ff. which is arranged below the scale pan l3.

If the roller (1" moves on the pressure plate b the plate "b will be depressed because the roller is clamped. The lever also rotates with The roller f is pressed against empties the weighed tobacco inthe bucket I.

Several weighing devices may be operated by varying the position of the roller relative to the buckets. r

What is claimed is:

h In an automatic tobacco weigher with a coarse anda' fine charging period, means for weighing the tobacco, -separate conveyor bands, apronged conveyor band for coarse charging the weighing means, a portion of which towards the delivery end forms a downwardly inclined path, and a conveyor band forfine charging the weighing means, means for charging the pronged conveyor band with coarse (long-fibre) tobacco and means for charging the other conveyor band with PAULA DAMM,

Heiress'of Walter Damm, Deceased. 40 

